Grinding-machine.



3. N. HEALD.

GRINDING MACHINE.

wpucmon FILED. JAN. 2. l9l8.

1 ,285, l 59 Patented Nov. 19, 1918.

Q 2 SHEETS-SHEET l- 1. N. HEALD.

GRINDING MACHINE.

APPLICATION n50 JAN. 2. 191a.

Patented Nov. 19, 1918.

2 SHEETS-SHEET 2.

tion of the table,

, OFFIC.

JAMES N. HEALD, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO HEAL!) MACHINE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GRINDIN G-MACHIN E.

Patented Nov. 19, 1918.

Application filed January 2, 1918. Serial N o. 209,824.

To all whom it may concern Be it known that I, JAMEs N. HEALD, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Grinding-Machine, of which the following is a specification.

This invention relates to a grinding machine, and articularly to improved devices for vertical y adjusting the work supporting table. For certain classes of work the range of vertical adjustment required is very limited and at the same time great strength and rigidity in the work supporting structure is essential. Such conditions arise where large numbers of duplicate parts are to be ground, andalso where parts are ground upon special fixtures which are designed to substantiall correspond with the normal elevation of t e table.

It is an object ofmy invention to provide a grin g machine in which limited but very accurate vertical adjustment of the work table is provided and in which the adjustmentis very accurately maintained. It is a fi rther object of my invention to so arrange the reversin mechanism that the adjustment-thereof wil remain unchanged when the table is vertically adjusted.

With these objects in view, my invention in its preferred form comprises a lower sliding table havin a second or upper table mounted thereon, t e two tables having cooperating inclined bearing surfaces, and means being provided for moving the secend or upper table longitudinally of the lower table. Such longitudinal movement causes a resultant limited vertical adjust- ,ment of the upper table.

-dmally with the table when the latter is adjusted. :The longitudinal relation of the dogs and work is thus unchanged.

My invention further relates to arrangements and combinations of parts hereinafter described'and more particularly pointed out in the appended claims.

The shown in the drawings, in which- Figure 1 is a front elevationof a grinding machine in which m improved work supporting table is embo ied;

r Fig. 2 is a detail front elevation of a poron an enlarged scale;

referred form of my invention is- Fig. 3 is a longitudinal sectional elevation I of the work supporting table;

1ng machine comprising a base or frame 10 having a head 11 in which is supported the grindin spindle 12 carrying the grinding wheel The spindle 12 1s eccentrically mounted in a sleeve 13 rotatable in bearings 14 in the head 11. The spindle 12 is driven through belts 15 and 16, and the sleeve 13 is driven through a belt 17 and gearing (not shown) from driving shafts mounted in the lower portion of the base 10.

A table 20 is mounted to slide longitudinally in ways or bearings 21 (Fig. 5) formed in the upper surface of the base 10. Suitable devices not shown in detail are provided for moving the table 20 longitudinally, such devices being driven through a shaft 22 and being controlled through speedv changing devices 23 and 24 of usual construction.

An inclined bearing surface 25 is formed on the upper side of the table 20, on which surface is supported a second table 26 having a corresponding inclined bearing surface 27 on its lower 'face. Provision is made for moving the table 26 longitudinally of the table 20, such provision including a nut 28 having a shank portion 29 mounted to slide vertically in a socket 30 in the table 26.

A threaded feed shaft 31 for the nut 28 is mounted in a bearing 32 in the table'20 and is provided with a bevel pinion 33 meshin with a corresponding pinion 34 (Fig. 4 on ashaft 35 also mounted in the table 20 and squared at its outer end to receive a wrench or handle. By turning the shaft 35 the table 26 may be moved longitudinally of the table 20 and such movement will cause a resultant vertical adjustment of the table 26. This adjustment, whileIlimited in extent, may be made with extreme acthe upper surface of the table 26, as best 11o 20 I provide for them a slide hard? shown in Fig. 3. Lateral adjustment is ohtained by the use or the usual cross feed screw ll cooperating with a nut on the slide l (not shown),

The longitudinal feed mechanism for the table includes a reversing lever d2 positioned for engagement by dogs d8 and A by which the table feed is automatically reversed. Each dog 13 or aid is mounted upon it stand adjustable longitudinally of the work table. Adjusting screws l5 on the stands 45 provide for close adjustment of the reversing dogs. instead or mounting the stands 45 in the usual way upon the table supported by arms d8 and i9 extending downward from the table 26 to which they are secured. By this arrangement l urn able to adjust the table 26 longitudinally of the table 20 without changing the position of the dogs 43 and relatively to the work supported upon the table 26 or upon the cross slide d0.

Many important advantages are secured by the arrangement of parts above described. I dispense entirely with the use or" a vertically adjustable overhanging knee for the table 20 and l support the table 20 upon fixed ways formed directly upon the base 10.

- Vertical adjustment of the table 26 relative to the table 20 may he made with extreme accuracy, and when once made is securely maintained.

Furthermore, this close vertical adjustment maybe made without changing the ad justment of the reversing mechanism. This is an advantage of great importance when grinding to a shoulder, orto the end of a hollow cylinder, and in other similar situations'.

Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope or my invention as set forth in the claims, and l do not wish to be otherwise limited to the details herein disclosed, but

1 claim iS-r l. A grinding machine having, in conihion said lower table and adjustable on inclined bearing surfaces thereon, means to relatively adjust said tables, feeding and reversing mechanism for said lower table, and feed controlling devices secured to said upper table and movable therewith when said table is adjusted.

3. A grinding machine having, in combination, a frame, a lower table slidable longitudinally thereon, an upper table adjustably mounted on said lower table, feeding and reversing mechanism for said tables, and feed controlling devices secured to said upper table and movable therewith when said table is adjusted, said devices comprising reversing dogs, and a slide bar upon which said dogs are adjustebly mounted, said her being fixed to said upper table and movable therewith.

testimony whereof I have hereunto at; lined my signature.

JAMES N, dEALl). 

